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BQ24090充电问题

Other Parts Discussed in Thread: BQ24090

我用BQ24090做单节俩电池充电管理,硬件设计:ISET接1K电阻到地,PRE-TERM接2K电阻到地,VSS ,GND,ISET2接地,PG,NC,TC悬空;问题:充电电流有500毫安,但是CHG脚被拉高了,为什么?